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Plates on the Move
Guide to plate movementBy: Mrs. Baker
There are three types of plate movement
1. Divergent
• Also known as seafloor spreading
• Plates are separating from each other as a new land mass forms
• This is seen at mid-ocean ridges and rifts
• Plate separation is a slow process. For example, divergence along the Mid Atlantic ridge causes the Atlantic Ocean to widen at only about 2 centimeters per year.
Picture from www.geology.com
Author Hobart M. King
2. Convergent
• Two continental plates collide. & crumple the edges of the plates & form mountains.
• We can see the end result of the collision between the Indian & Eurasian plates which are the Himalayan Mountains.
Picture from www.geology.com Author Hobart M. King
Picture from USGS
Subduction
• When an oceanic plate goes underneath or is subducted under a continental plate it is called subduction.
• This forms a trench, or deep valley, where the plates meet.
• An example of a subduction zone is the Marianas Trench where the Pacific Plate is subducting under the Eurasian Plate.
• Subduction is another type of a convergent plate movement.
Picture from www.geology.com Author Hobart M. King
3. Transform
• Two plates slide past each other– Example: San Andreas
Fault in California
Picture from www.geology.com
Author Hobart M. King
DivergentDivergent ConvergenConvergentt
TransformTransform
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